Answer:
69
Explanation:
67 67 69 70 70 74 75 78 79 79 80
______________
67 67 69 70 70 -> First Quartile
74 - Middle Quartile
75 78 79 79 80 -> Third Quartile
First Quartile -> 67 67 69 70 70
69 is middle
Answer = 69
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